package com.example.demo.config;
import com.example.demo.model.Result;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.SneakyThrows;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {
      @Autowired
      private ObjectMapper objectMapper;

      @Override
      public boolean supports(MethodParameter returnType, Class converterType) {
        //改成true我们的统一结果才会生效
          return true;
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        //在返回之前需要做的事情
        if (body instanceof Result){
            return  body;
        }
        if (body instanceof String){
            return objectMapper.writeValueAsString(Result.success(body));
        }
        return Result.success(body);
    }

}
